Question 7: If diagonals of a cyclic quadrilateral are diameters of the circle through the vertices of the quadrilateral, prove that it is a rectangle.
Prerequisite
This question has been solved by two different methods – both are equally easy to use.
- Using properties of circle
- Using SAS triangles congruence
Angle in a semicircle is a right angle
Also, following theorem has been discussed as an alternative to prove one of the sections of this question.
Theorem 10.11: The sum of either pair of opposite angles of a cyclic quadrilateral is 180 degree.
The other approach used to solve this method is the SAS congruence rule for triangles. It is highly recommended that you must know about the different congruence postulates. These are quite frequently used in geometry. In the following video tutorial, different types of congruence postulates (axioms) are explained along with the difference between congruence and similarity.
Congruence v/s Similarity
